Mari Senkawa is a supporting character in the anime and manga series Aqua Age, known in Japanese as Mizuiro Jidai. She is a junior high school student and a member of the main protagonist Yuuko Kawai’s circle of friends at school. Commonly referred to by the nickname Maririn, she is especially close with another friend, Rumiko, though she also maintains a strong friendship with Yuuko. Her personality is defined by her talkative nature and a pronounced habit of listening to and spreading gossip, which often makes her a source of social information within the group. While her motivations are not explored in depth, her actions suggest a desire to be involved in the social dynamics of her classmates and to maintain her position within the friend group. In the story, Mari serves as a typical school friend who contributes to the slice-of-life atmosphere through her chatter and lively interactions, providing both comic relief and a sense of everyday realism. Key relationships include her bond with Rumiko, with whom she is most often seen, and her friendly dynamic with Yuuko. There is no significant character development shown for Mari, as she remains a consistent secondary figure throughout the series. Her notable abilities are limited to her social skills, particularly her talent for picking up and disseminating information among her peers.